遠心圧縮機の翼振動に関する研究 : ミスチューン応答特性の実験的評価

概要

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Experimental studies by using Non-Intrusive stress measurement system (NSMS) and strain gage (SG) were performed to reveal the forced response characteristics of mistuned radial compressor. Blade to blade variation in resonant frequency and resonant stress were evaluated from the data obtained by NSMS. Calculated variation in resonant frequency and resonant stress were found to be smaller than the values generally appeared in the radial turbine impeller. Back-to-back evaluation was performed for the measured data of vibratory displacement (NSMS) and strain (SG) for the same blade. Difference between the stresses converted from each measurement data (NSMS and SG) was below 17% and was considered to be acceptable level for the practical use. Additionally, forced response analysis was performed for the mistuned FE model. Analytical results showed the extremely different response characteristics between the two types of slightly different mistuning patterns and the importance of the mistuning identification.
公益社団法人日本ガスタービン学会の論文
2014-07-18